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Hi Eric,
Just want to let you know: LOVE your work on YouTube!
I have a Mitsubishi Galant Stationvagon 2.0 year 2000 with an A/C problem. I have sent you a link to my YouTube video, the only problem is that it is in Norwegian, my native language. What I can tell you is that the system has gas, but no movement on the meters even with the A/C on. What would you recommend me to do? Do I use my vakuum pump to empty the system and recharge it or is it something else such as the compressor or just a faulty cable?
Keep you great work! Big fan!
-Andreas
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If there is no pressure change when the A/C is switched on, the compressor is internally failed or it is not turning at all because the compressor clutch is failing to engage. It is a simple part with a one wire connector that is supplied power when the compressor is supposed to engage, and grounds thru the body of the compressor to the engine ground. There should be ground present at the connector on the AC compressor. If not, the compressor clutch field coil has a open circuit meaning it has failed.
When the A/C is turned on from inside the car, there should be power on the harness side of the compressor connector. That power is supplied by a relay in the underhood fuse box, and that circuit has a dedicated compressor clutch fuse that supplies power to that relay.
If that small can of R134 is all you put into an empty system, I’d be suspicious that it just wasn’t enough. For what little I could see of those gauges in the video, I’d dare to guess it wasn’t. That can of R134 looks like it’s about 12 oz. or 340 gm at best and you’d probably need around double that for a full charge. There might be a label with some service information under the hood and it could tell you the actual refrigerant capacity for your system if it’s still there. There’s always going to be a pressure switch in an AC system to protect the compressor. The R134 is what moves oil through the compressor to keep it lubricated so a lack of pressure keeps the compressor off intentionally. Evacuating the AC into a vacuum is the right thing to do any time you need to recharge to keep non condensable gases out and remove moisture. Your AC might not work so well even with a full charge.
Good luck.
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